Hi Tom. If the seeing is poor planetary imaging is hardly worth the effort regardless of camera and focal length. The C11 is quite a capable planetary scope and either configuration will give good results when the seeing allows but if you do image in poor seeing, the native focal length would be less compromised by the conditions regardless of which camera you use. The set ups you mention are so close in resolution etc that the differences are hardly worth thinking about. Also, I believe that the ASI664 has 2.9um pixel size, doesn't really make much difference for this exercise though. Try both configurations out and compare the results.
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